For fiber-optic mid-infrared bio- and chemical-sensing, Ge-Sb-Se glass optical fibers are more attractive than Ge-As-Se because of: (i) lowered toxicity and (ii) lower phonon energy and hence transmission to longer wavelengths, with potential to reach the spectral ‘fingerprint region’ for molecular sensing. There is little previous work on Ge-Sb-Se fibers. Here, fibers are fabricated from two glass compositions in the GexSb10Se90-x atomic (at.) % series. Both glass compositions are of similar mean-coordination-number, lying in the overconstrained region, yet of different chemical composition: stoichiometric Ge25Sb10Se65 at. % and non-stoichiometric Ge20Sb10Se70 at. %. Thermal analysis on bulk glasses has previously shown that the former exhibited the maximum glass stability of the series. However, during fiber-drawing of Ge25Sb10Se65 at. %, the preform tip is found to undergo surface-devitrification to monoclinic GeSe2 alone, the primary phase, no matter if the preform is an annealed, as-melted rod or annealed, extruded rod. The heating rate of the preform-tip to the fiber-drawing temperature is estimated to be up to ~ 100 °C min−1 to ~ 490 °C. Lower heating rates of 10 °C min−1 using thermal analysis, in contrast, encourage crystallization of both Sb2Se3 and GeSe2. The non-stoichiometric: Ge20Sb10Se70 at. % composition drew successfully to low optical loss fiber, no matter whether the preform was an annealed, as-melted rod or annealed, extruded rod. This article is protected by copyright. All rights reserved.

中文翻译：

---

与光纤制造相关的 Ge-Sb-Se 玻璃中结晶的成分依赖性

对于光纤中红外生物和化学传感，Ge-Sb-Se 玻璃光纤比 Ge-As-Se 更具吸引力，因为：（i）降低毒性和（ii）降低声子能量，因此传输到更长的波长，有可能达到分子传感的光谱“指纹区域”。以前很少有关于 Ge-Sb-Se 纤维的工作。此处，纤维由 GexSb10Se90-x 原子 (at.) % 系列中的两种玻璃成分制成。两种玻璃成分具有相似的平均配位数，位于过约束区域，但化学成分不同：化学计量的 Ge25Sb10Se65 at。% 和非化学计量的 Ge20Sb10Se70 at。%。先前对大块玻璃的热分析表明，前者表现出该系列中最大的玻璃稳定性。然而，在 Ge25Sb10Se65 的光纤拉制过程中。%, 发现预制棒尖端发生表面反玻璃化，变成单斜晶 GeSe2，即主相，无论预制棒是退火的、熔化的棒还是退火的、挤出的棒。预制棒尖端到光纤拉伸温度的加热速率估计高达 ~ 100 °C min-1 到 ~ 490 °C。相比之下，使用热分析降低 10 °C min-1 的加热速率会促进 Sb2Se3 和 GeSe2 的结晶。非化学计量：Ge20Sb10Se70 at。% 成分成功地拉制成低光学损耗光纤，无论预制棒是退火的熔融棒还是退火的挤出棒。本文受版权保护。版权所有。挤压棒。预制棒尖端到光纤拉伸温度的加热速率估计高达 ~ 100 °C min-1 到 ~ 490 °C。相比之下，使用热分析降低 10 °C min-1 的加热速率会促进 Sb2Se3 和 GeSe2 的结晶。非化学计量：Ge20Sb10Se70 at。% 成分成功地拉制成低光学损耗光纤，无论预制棒是退火的熔融棒还是退火的挤出棒。本文受版权保护。版权所有。挤压棒。预制棒尖端到光纤拉制温度的加热速率估计高达 ~ 100 °C min-1 到 ~ 490 °C。相比之下，使用热分析降低 10 °C min-1 的加热速率会促进 Sb2Se3 和 GeSe2 的结晶。非化学计量：Ge20Sb10Se70 at。% 成分成功地拉制成低光学损耗光纤，无论预制棒是退火的熔融棒还是退火的挤出棒。本文受版权保护。版权所有。无论预制件是退火的熔化棒还是退火的挤压棒。本文受版权保护。版权所有。无论预制件是退火的熔化棒还是退火的挤压棒。本文受版权保护。版权所有。